why does rahim go to find hassan? chapter 16

Rahim went searching for Hassan in 1986 because he was dreadfully lonely, so many of his relatives and friends having been killed or fled since 1981. He was managing to take care of the house and himself despite his age and arthritis, but when the news of Baba's death reached him, he felt the weight of it all was too much. He drove to Hazarajat, where Ali and Hassan had been living, and was directed to a village outside Bamiyan. He found Hassan, now in his early twenties, and his pregnant wife, Farzana, living in a small hut. Hassan was overcome with joy when he saw Rahim Khan. He told him that Ali had been killed by a land mine two years before. He asked many questions about Amir. Initially, Hassan and Farzana refused to move to Baba's house, but then Rahim told him of Baba's death. Hassan cried all through the night and in the morning he agreed to move in with Rahim Khan.